diff --git a/dita/RTC-NG/config/keys-rtc-ng-api-ios.ditamap b/dita/RTC-NG/config/keys-rtc-ng-api-ios.ditamap
index 131d9a1db2a..31b09e1621f 100644
--- a/dita/RTC-NG/config/keys-rtc-ng-api-ios.ditamap
+++ b/dita/RTC-NG/config/keys-rtc-ng-api-ios.ditamap
@@ -71,23 +71,17 @@
     </keydef>
     <topichead navtitle="Interface classes">
         <keydef keys="IRtcEngine" href="../API/class_irtcengine.dita">
-            <topicmeta>
-                <keywords>
-                    <keyword>AgoraRtcEngineKit(Ex)</keyword>
-                </keywords>
-            </topicmeta>
-        </keydef>
-        <keydef keys="IMediaEngine" href="../API/class_imediaengine.dita" props="hide">
             <topicmeta>
                 <keywords>
                     <keyword>AgoraRtcEngineKit</keyword>
                 </keywords>
             </topicmeta>
         </keydef>
+        <keydef keys="IMediaEngine" href="../API/class_imediaengine.dita" props="hide"/>
         <keydef keys="IRtcEngineEx" href="../API/class_irtcengineex.dita">
             <topicmeta>
                 <keywords>
-                    <keyword>AgoraRtcEngineKit</keyword>
+                    <keyword>AgoraRtcEngineKitEx</keyword>
                 </keywords>
             </topicmeta>
         </keydef>
@@ -1083,28 +1077,28 @@
             <keydef keys="startPreview" href="../API/api_irtcengine_startpreview.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>startPreview [1/2]</keyword>
+                        <keyword>startPreview</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="startPreview2" href="../API/api_irtcengine_startpreview2.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>startPreview: </keyword>
+                        <keyword>startPreview:</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="stopPreview" href="../API/api_irtcengine_stoppreview.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>stopPreview [1/2]</keyword>
+                        <keyword>stopPreview</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="stopPreview2" href="../API/api_irtcengine_stoppreview2.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>stopPreview: </keyword>
+                        <keyword>stopPreview:</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
diff --git a/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap b/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
index 23f2d98c17a..407da6ac82e 100644
--- a/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
+++ b/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
@@ -49,23 +49,17 @@
     </keydef>
     <topichead navtitle="Interface classes">
         <keydef keys="IRtcEngine" href="../API/class_irtcengine.dita">
-            <topicmeta>
-                <keywords>
-                    <keyword>AgoraRtcEngineKit(Ex)</keyword>
-                </keywords>
-            </topicmeta>
-        </keydef>
-        <keydef keys="IMediaEngine" href="../API/class_imediaengine.dita" props="hide">
             <topicmeta>
                 <keywords>
                     <keyword>AgoraRtcEngineKit</keyword>
                 </keywords>
             </topicmeta>
         </keydef>
+        <keydef keys="IMediaEngine" href="../API/class_imediaengine.dita" props="hide"/>
         <keydef keys="IRtcEngineEx" href="../API/class_irtcengineex.dita">
             <topicmeta>
                 <keywords>
-                    <keyword>AgoraRtcEngineKit</keyword>
+                    <keyword>AgoraRtcEngineKitEx</keyword>
                 </keywords>
             </topicmeta>
         </keydef>
@@ -1040,28 +1034,28 @@
             <keydef keys="startPreview" href="../API/api_irtcengine_startpreview.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>startPreview [1/2]</keyword>
+                        <keyword>startPreview</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="startPreview2" href="../API/api_irtcengine_startpreview2.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>startPreview: </keyword>
+                        <keyword>startPreview:</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="stopPreview" href="../API/api_irtcengine_stoppreview.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>stopPreview [1/2]</keyword>
+                        <keyword>stopPreview</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>
             <keydef keys="stopPreview2" href="../API/api_irtcengine_stoppreview2.dita">
                 <topicmeta>
                     <keywords>
-                        <keyword>stopPreview: </keyword>
+                        <keyword>stopPreview:</keyword>
                     </keywords>
                 </topicmeta>
             </keydef>